The JC doesn’t like the sorts of signs that warn you, or forbid you, or tell you what you can or cannot do. They emanate from the same passive aggressive instinct as the email sent from an unmonitored account — they’re a cheap shot at someone who can’t hit back — and more to the point they are a failure in design: if you don’t people to walk on your grass, stick up a fence, or pave the damn thing, or create some obstacle — do with code what you are trying to do with bossiness.